CONFIGURATION OSPF ROUTEUR CISCO PDF

Using this feature, you can configure broadcast networks as NBMA networks when, for example, you have routers in your network that do not support multicast addressing. Configuring NBMA networks as either broadcast or nonbroadcast assumes that there are virtual circuits VCs from every router to every router, that is, a fully meshed network. This is not true in some cases, for example, because of cost constraints or when you have only a partially meshed network. In these cases, you can configure the OSPF network type as a point-to-multipoint network. Routing between two routers that are not directly connected will go through the router that has VCs to both routers. Note that you need not configure neighbors when using this feature.

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OSPF can be used for service-side routing, to provide reachability to networks at the local site, and it can be used for transport-side routing, to enable communication between the vEdge router and other Viptela devices when the router is not directly connected to the WAN cloud. See the VPN help topic.

In the Device tab, click Create Template. From the Device Model drop-down, select the type of device for which you are creating the template. The OSPF template form is displayed. The top of the form contains fields for naming the template, and the bottom contains fields for defining OSPF parameters.

Click the Service VPN drop-down. In the Template Name field, enter a name for the template. The name can be up to characters and can contain only alphanumeric characters. In the Template Description field, enter a description of the template. The description can be up to characters and can contain only alphanumeric characters. When you first open a feature template, for each parameter that has a default value, the scope is set to Default indicated by a check mark , and the default setting or value is shown.

To change the default or to enter a value, click the scope drop-down to the left of the parameter field and select one of the following: Parameter Scope Scope Description Device Specific indicated by a host icon Use a device-specific value for the parameter. For device-specific parameters, you cannot enter a value in the feature template. You enter the value when you attach a Viptela device to a device template. When you click Device Specific, the Enter Key box opens.

This box displays a key, which is a unique string that identifies the parameter in a CSV file that you create. This file is an Excel spreadsheet that contains one column for each key. The header row contains the key names one key per column , and each row after that corresponds to a device and defines the values of the keys for that device. You upload the CSV file when you attach a Viptela device to a device template. For more information, see Create a Template Variables Spreadsheet.

To change the default key, type a new string and move the cursor out of the Enter Key box. Global indicated by a globe icon Enter a value for the parameter, and apply that value to all devices.

Examples of parameters that you might apply globally to a group of devices are DNS server, syslog server, and interface MTUs. All these parameters are optional.

For OSPF to function, you must configure area 0, as described below. Range: 0 through

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Normally to adjust cost on a route you would adjust the cost value on an interface itself. This, however, affects all routes learned via this interface. If router learns multiple routes to a destination, 1 Router first finds longest prefix match in IP routing table to find outgoing interface. Example: Router R1 learned OSPF automatic cost calculation is an inverse function of bandwidth of an interface. As higher the bandwidth values of an interface, the lower the cost value. The result of this is that OSPF routers in the network cannot make an accurate path calculation when comparing fast Ethernet interface versus a gigabit Ethernet interface as both interfaces has a cost of 1.

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